I've found out what kded4 is now and the problem is the Detecting RANDR (Monitor) changes service. If you stop that service in system settings the flickering stops and kded4 can still be run.
I've found out what kded4 is now and the problem is the Detecting RANDR (Monitor) changes service.
If you stop that service in system settings the flickering stops and kded4 can still be run.